After sorting datagridview why some columns values are nothing ?

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VB

1-I have add some rows at runtime.
2-Then i have sort ItemCode column using methode

System.ComponentModel.ListSortDirection.Ascending

3-Then I have reorder srNo column as 1,2,3,...
4-Then i read the DataGridView row using for loop.

Then the problem is that i got srNo column cell value 1 but itemCode cell show nothing .

What I have tried:

Dim i As Integer = 0
                        DataGridView2.Sort(DataGridView2.Columns(1), System.ComponentModel.ListSortDirection.Ascending)
                               ReorderSrNo()

For i = 0 To DataGridView2.Rows.Count - 1 ''Add Items To Physical Stock
                            Dim SRno= DataGridView2.Rows(i).Cells(0).Value
                            Dim ItemCode= DataGridView2.Rows(i).Cells(1).Value

Next

Public Sub ReorderSrNo()
        Dim counter As Integer = 0
        For ii As Integer = 0 To DataGridView2.Rows.Count - 1
            DataGridView2.Rows(ii).Cells(0).Value = (System.Math.Max(System.Threading.Interlocked.Increment(counter), counter - 1)).ToString()
        Next
        Dim no As Integer
        no = DataGridView2.Rows.Count
    End Sub